That's not the only problem with LiFePO4; it has much less energy density too. It has a lower operating voltage, so you don't get as much energy per volume of battery.
I don't care if batteries get safer. I'm not against improving safety, but if you're in an accident where the batteries caught fire and you can't escape, that was already an extremely severe accident that you weren't likely to survive in the first place.
15 years from now crashes will be a rare thing that is reported on the news rather than a daily occurrence during rush hour that doesn't make the nightly news.
The real enemy of safety is the crashing, not the batteries (or gasoline).
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